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Multiple Personality Disorder

Dissociative identity disorder (DID), also known as multiple personality disorder (MPD), is an extremely rare mental disorder characterized by at least two distinct and relatively enduring identities or dissociated personality states that alternately control a person’s behavior, and is accompanied by memory impairment for important information not explained by ordinary forgetfulness. These symptoms are not accounted for by substance abuse, seizures, other medical conditions, nor by imaginative play in children. Diagnosis is often difficult as there is considerable comorbidity with other mental disorders. Malingering should be considered if there is possible financial or forensic gain, as well as factitious disorder if help-seeking behavior is prominent.

DID is one of the most controversial psychiatric disorders with no clear consensus regarding its diagnosis or treatment. Research on treatment effectiveness still focuses mainly on clinical approaches and case studies. Dissociative symptoms range from common lapses in attention, becoming distracted by something else, and daydreaming, to pathological dissociative disorders. No systematic, empirically-supported definition of “dissociation” exists. Source: http://en.wikipedia.org/wiki/Dissociative_identity_disorder